1221109488 has 60 divisors (see below), whose sum is σ = 3419986960. Its totient is φ = 406729728.

The previous prime is 1221109457. The next prime is 1221109523. The reversal of 1221109488 is 8849011221.

It is a happy number.

It is a super-2 number, since 2×1221109488² = 2982216763367244288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 268320 + ... + 272832.

Almost surely, 2^1221109488 is an apocalyptic number.

1221109488 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1221109488 is an abundant number, since it is smaller than the sum of its proper divisors (2198877472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221109488 is a wasteful number, since it uses less digits than its factorization.

1221109488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6406 (or 6397 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 1221109488 is about 34944.3770584053. The cubic root of 1221109488 is about 1068.8535448257.

The spelling of 1221109488 in words is "one billion, two hundred twenty-one million, one hundred nine thousand, four hundred eighty-eight".